Family name origins & meanings
- English : habitational name from Thornborough in North Yorkshire (Thornebergh in 12th-century records) or Thornbrough in Northumberland and North Yorkshire (T(h)orneburg in 13th-century records). The former is probably so named from Old English þorn ‘thorn bush’ + beorg ‘hill’; the latter from þorn + burh ‘fort’. Other possible though less likely sources are Thornbury in Devon, Gloucestershire, or Herefordshire, which are all named from Old English þorn + byrig, dative of burh ‘fortified place’.
- Possibly an Americanized spelling of Swedish Thornberg.